calling default lambda only once per delegate

[tobiberger]

When using a missing argument multiple times, the lambda that provides a default value was called at every use of the delegate. In some cases, like asking the user to input the value on command line, this behaviour can be undesirable.

[codecov-io]

Codecov Report

Merging #69 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #69      +/-   ##
============================================
+ Coverage      84.9%   84.94%   +0.03%     
  Complexity      138      138              
============================================
  Files            11       11              
  Lines           424      425       +1     
  Branches         84       84              
============================================
+ Hits            360      361       +1     
  Misses           27       27              
  Partials         37       37

Impacted Files	Coverage Δ	Complexity Δ
...c/main/kotlin/com/xenomachina/argparser/Default.kt	84.21% <100%> (+0.87%)	0 <0> (ø)	⬇️

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